[mpich-discuss] How does MPICH spawn processes, and is there a way to configure it?

Lu, Huiwei huiweilu at mcs.anl.gov
Thu May 29 08:54:28 CDT 2014

Hi Scott,

Check https://wiki.mpich.org/mpich/index.php/Using_the_Hydra_Process_Manager to see if it is what you want.


On May 29, 2014, at 6:37 AM, Scott O'Malley <scottyomalley at gmail.com> wrote:

> I have recently built a cluster of Raspberry Pi computers. When this was made up of a master node and 2 slave nodes there was no issue calling mpiexec across the cluster. When I add an additional node to the cluster bringing the size to 1 master and 3 slave nodes I get an error of "Host File Verification Failed". I've tested password-less SSH on all nodes and it's working correctly.
> I've done some googling of the error and set up and the only mention I've gotten to it was on this link here relating to OpenMPI - http://www.open-mpi.org/community/lists/users/2013/11/22940.php
> Is there a similar setup for MPICH and if so can someone link me to the correct documentation page?
> Cheers
> Scott
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